fix: add libproj-dev to unblock Docker build (#707)

* fix: add libproj-dev to unblock skyproj build

skyproj 2.3.0 (pulled transitively via cs_util==0.1.9) now requires
the PROJ C library at build time, breaking the develop Docker build
since 2026-03-31.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix: also install proj-bin for skyproj build

skyproj setup.py looks for the proj executable on PATH (or PROJ_DIR).
libproj-dev only provides headers; proj-bin provides the binary.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: cailmdaley

Dockerfile

@@ -37,6 +37,8 @@ RUN apt-get update -y --quiet --fix-missing && \
     make \
     openmpi-bin \
     libopenmpi-dev \
+    libproj-dev \
+    proj-bin \
     pkg-config \
     protobuf-compiler \
     psfex=3.21.1-1 \